5764results about How to "Low water absorption" patented technology

A bone implant and the method of manufacturing thereof, the bone implant, in particular an inter-vertebral implant, made of a radiation-permeable material. The inter-vertebral implant defining a surface and comprising a front section, a back section, two lateral sections defining a central axis, and a substantially hollow interior chamber, each section having a superior and inferior vertebral contacting surface. The hollow chamber is subdivided by at least two partitions running essentially parallel to the central axis and which connect the front section to the back section.

The invention relates to an alicyclic-containing polyimide film. The molecular structure general formula of the film is the right formula, wherein, -CA- is a bivalence connection group of an alicyclic dibasic primary amine, -Ar- is a bivalence connection group of an aromatic dibasic primary amine, and -R- is a bivalence connection group of an aromatic dibasic estolide. The preparation thereof includes: the alicyclic dibasic primary amine and the aromatic dibasic primary amine are dissolved in non-proton organic solvent with strong polarity, the aromatic dibasic estolide is added, the non-proton organic solvent with strong polarity is used for regulating the viscosity of the alicyclic-containing polyamic acid resin solution after reaction for 1-3 hours, forming is carried out in a curtain coating machine, and dehydration fever imidization, cooling and demoulding are carried out so as to obtain the film. The preparation method has mild reaction condition and low cost and is environmentally friendly; and meanwhile, the alicyclic-containing polyimide film has excellent mechanic property and heat resistant property and low water absorption, and the visible light transmission thereof is as high as more than 97%. The film has good application prospect in the fields of optical waveguide material, photorefractive material and photoelectric material in optical communication field and direct action membrane material in the liquid crystal display field and the like.

The invention relates to a silicon dioxide aerogel material and a preparation method thereof. The method comprises the following steps: by using water glass as silicon source, adding an acid-containing organic solvent free of chlorine ions and fluorine ions to generate a precipitate of sodium ions, potassium ions and other metal salt ions, filtering to remove the precipitate to obtain high-purity silica sol, carrying out a sol-gel process, aging, acidifying, modifying, and drying to obtain the silicon dioxide aerogel material. The acidification before modification enhances the surface reaction activity of the silicon gel, thereby obviously enhancing the modification effect and efficiency. The method has the advantages of low cost and simple and efficient technique, is beneficial to mass high-efficiency production, is free of chlorine ions and fluorine ions in the whole technical process, and enhances the equipment operation safety and reliability; and the product can be used for heat preservation and thermal insulation of nuclear power and liquefied natural gas equipment and pipelines with higher requirement for corrosion resistance, and can also be used for thermal insulation in the field of aerospace, petrochemical engineering, track transportation, ships, automobiles, construction and the like.

To provide a cellulose fiber composite having high transparency, low water absorption and low coefficient of linear thermal expansion.A fiber composite which comprises fibers having an average fiber diameter of at most 30 nm and a matrix material and which has a haze of at most 5 according to JIS K-7136 when the fiber composite has a thickness of 100 μm.

A liquid curable resin composition exhibiting superior storing stability and suitable for use as a material for optical fiber ribbon matrix, a bundling material, and a material for up-jacketing fibers. The composition contains a first polydimethylsiloxane compound which contains (i) at least two urethane bonds, (ii) an unreactive organic group attached to at least one end of the first polydimethyl-siloxane, and (iii) a (meth)acrylol group attached to at least one end of the first polydimethylsiloxane, and a second polydimethylsiloxane compound which contains (i) at least two urethane bonds and (ii) an unreactive organic group attached to at least one end of the second polydimethylsiloxane, and optionally a third polysiloxane compound which does not contain urethane bonds.

The invention discloses a new macromolecule fiber composite material which is prepared by the following components in parts by weight, 40-100 parts of plant fiberfill, 60-100 parts of plastic base material, 3.5-5 parts of heat stabilizer, 1-2 parts of plasticizer, 1.6-2 parts of lubricating agent, 4-8 parts of modifying agent, 1-3 parts of compatilizer, 2-3 parts of coupling reagent, 1-5 parts of super dispersing agent, 1-4 parts of positive ion surface active agent, 1-1.8 parts of foaming agent, 1-5 parts of blowing promoter, 0.3-1.2 parts of antioxygen, 1-10 parts of cross-linking agent, 1-20 parts of nucleating agent, 0.8-1 part of viscosity reducer, 0.8-1 part of tackifier and 3.2-13.4 parts of other auxiliaries. The new composite material can not easily cause wet swelling and air shrinkage, and is low in expansibility and water absorbability, so that the prepared product has good stability.

The invention discloses a colorless and transparent aromatic polyimide film which has the general formula of molecular structure as follows; the preparation thereof includes: aromatic primary amine and aromatic acid anhydride with specific molecular structures are adopted for polymerization in a strong polar aprotic organic solvent system within the temperature range of 0 DEG C to 35 DEG C to prepare a colorless and transparent viscous polyamide acid solution with homogeneous phase. Viscosity adjustment, casting for forming the film, heating for rising temperature and solvent removal are carried out simultaneously when partial imidization reaction is carried out, and then demoulding and stretching, further deep thermal imidization and rolling are carried out to obtain the colorless and transparent aromatic polyimide film. No special production equipment is required by the invention so that production can be carried out on the conventional production line of the polyimide film and the polyimide film is applicable to industrialized production.

The invention relates to a halogen-less high frequency resin composition, and a prepreg and a laminate manufactured by using the same. The halogen-less high frequency resin composition comprises the following components based on weight part of the organic solids: (A) 10 to 50 parts of styrene-maleic anhydride oligomer; (B) 10 to 50 parts of at least one compound containing dihydro-benzoxazine ring; (C) 10 to 50 parts of at least one polyepoxide; and (D) 5 to 30 parts of at least one phosphorus-containing flame retardant. The prepreg and the laminate manufactured by using the halogen-less highfrequency resin composition has low dielectric constant, low dielectric loss factor, high glass transition temperature, good heat resistance, low water absorbance, and simple and convenient technological operation.

A composite dielectric material comprising a resin resulting from a polyvinylbenzyl ether compound and a dielectric ceramic powder dispersed therein is useful in the high-frequency region. A composite magnetic material comprising a polyvinylbenzyl ether compound and a magnetic powder is also provided as well as a flame retardant material comprising a polyvinylbenzyl ether compound and a flame retardant. These materials may be used in the fabrication of substrates, prepreg sheets, coated metal foils, molded items, and metal foil-clad substrates.

A recording ink containing at least a solid component which contains a colorant and a resin and is a solid at 25° C., a liquid component which has a higher boiling point than that of water and is a liquid at 25° C. and water, wherein the total content of the liquid component in the recording ink is 20% by mass or less, the total content of the solid component in the recording ink is 20% by mass or more, and the total content of a resin component in the solid component is 40% by mass to 95% by mass relative to a total amount of the solid component is provided.

This invention discloses a new technology related to cellulose fiber reinforced cement composite materials using the loaded cellulose fibers. This invention discloses four aspects of the technology: fiber treatment, formulation, method and final product. This technology advantageously provides fiber cement building materials with the desirable characteristics of reduced water absorption, reduced rate of water absorption, lower water migration, and lower water permeability. This invention also impart the final products improved freeze-thaw resistance, reduced efflorescence, reduced chemical dissolution and re-deposition, and improved rot and fire resistances, compared to conventional fiber cement products. These improved attributes are gained without loss in dimensional stability, strength, strain or toughness.

Water-based wax emulsions, optionally for use in conjunction with alkaline copper and / or quaternary ammonium based preservatives systems, are described. These emulsions are comprised of natural or synthetic wax, nonionic surfactants having HL B values greater than 11, anionic surfactants, and water. Certain emulsion compositions as described in this specification posses the unique property of maintaining emulsion stability in wood preservatives during extended use in typical wood treatment processes. Water-repellant wood treated with the wax emulsions are described. A method of treating wood, comprising providing wood and treating the wood with the wax emulsion under conditions effective to increase its water repellency is also disclosed.

A method for carbon dioxide strengthening of a recycled concrete aggregate comprises the following steps: (1) crushing and sieving waste concrete; (2) placing the sieved recycled concrete aggregate in a sealed container, controlling the relative humidity of 30-90% and the CO2 concentration of 5-90%, and carrying out carbonization treatment; and (3) making the treated recycled concrete aggregate particles into recycled mortar and concrete. Compared with mortar prepared from a recycled concrete aggregate without treatment, the mortar prepared from the obtained recycled concrete aggregate after CO2 strengthening treatment enables the mortar early strength to be improved by 20.1%-22.0% and the later strength to be improved by 12.1%-13.9%; the 28 d drying shrinkage value can be reduced by 7.8%-16.7%; and the 28 d water absorption rate can be reduced by 7.7%-13.3%.